GI issues with higher mileage

Hi everyone! I have been running for over 9 years, so I’m fairly experienced when it comes to simple running + GI things.

This year I started ramping up my mileage to 40-65 most weeks, which is an increase from the 10-30 I would do before. My GI is all good during runs, however my daily bowel movements have changed. I’m going 3-5 times a day, and I have noticed that my movements have become softer and now have orange under them. I have tried increasing my fiber, but it’s still there.

Stool sample and bloodwork are all decently normal, outside of lower ferritin.

If anyone has dealt with this before, plz lmk!!