Anyone else seeing portfolio chart hover values inflated by ~30% compared to actual balance? Documented for 8 days, formal complaint filed.

Long-time Coinbase Canada user here (5+ years, multiple assets, ~1,800 transactions). Over the past week, I've been systematically documenting a bug that I've suspected for months but couldn't pin down until I started taking timestamped screenshots.

**The bug, simply:** When I hover over any historical point on my portfolio chart, the headline value displayed is inflated by approximately 30% compared to my actual portfolio value at that historical moment.

**Concrete example with timestamped screenshots:**

- April 29, 2026 at 15:59 — I captured my actual portfolio value displayed in real time: **3,344.43 CAD**

- April 30, 2026 at 16:00 — hovering over the same point (April 29, 16:00) on the graph: **4,401.03 CAD**

- Discrepancy: **+1,056.60 CAD (+31.6%)**

I've reproduced this on multiple devices (desktop browser, mobile app), at different times, on different chart views (1h, 1d, 1w, 1m). The pattern is consistent: hover values are systematically inflated by ~30%.

**What I've also documented:**

- Headline value during hover doesn't match the sub-totals (Crypto + Cash) shown simultaneously on the same screen

- Variations announced by Coinbase (24h, 1 week) don't match the variations derived from hover values themselves

- The chart curve sometimes shows movement opposite to the numerical values displayed

**The control test (this is interesting):**

My partner has a Coinbase account on her own device. Her account is recent, contains a single asset (Solana, ~$102 CAD), and has minimal transaction history. When she hovers over historical points on her chart, **everything is consistent**. No bug.

This isolates the problem to my account specifically — not the device, not the app version. It seems to affect older, complex accounts with extensive transaction history.

**Coinbase Support's response:**

I opened a case (#26535691) on April 29. After two email exchanges with a representative named Parker, I got what appears to be template responses confirming that:

- Portfolio charts are "derived views" that may diverge from underlying data

- Complex/older accounts are more affected by these visualization issues

- No fix timeline is committed

- My specific account will NOT be individually investigated

I've since filed a formal complaint under Section 10.2 (case #26596232) and notified the Autorité des marchés financiers (AMF) of Quebec, as Coinbase Canada is a Restricted Dealer registered with the CSA/AMF currently in transition to a full Investment Dealer registration.

**Why I'm posting:**

I know this issue has been reported for years (Coinbase's own blog acknowledged similar issues in 2018, and there was a major public incident in December 2021 with inflated prices). But I'm trying to determine:

1. **Am I alone?** Or are other long-term users seeing similar discrepancies?
2. **Is the ~30% pattern consistent across affected accounts**, or is mine unique?
3. **Has anyone successfully gotten Coinbase to fix this on their account?**

If you've experienced anything similar, I'd love to hear about it. Screenshots welcome (with sensitive info redacted, obviously).

**For reference, here's what to test on your own account:**

1. Open your portfolio on Coinbase
2. Set the view to 1 day or 1 week
3. Hover over a point that's at least 24h in the past
4. Compare the headline value to what your actual balance was at that time (you'd need to have noted it, or have an old screenshot)
5. Also check if the headline value matches the sub-totals (Crypto + Cash) shown on the same screen during hover

Not looking for sympathy or refunds — my actual balance appears intact. Just trying to document a systemic issue and find others who've experienced it.

Thanks for reading.