[help] Let's Split 2 rows producing incorrect output

The two middle rows of the left side of my Let's Split build produce combined keystrokes. For instance, when I press the "a" key, it produces "az" output. When I press the "z" key, it also produces "az". It does this consistently for both rows.

Steps taken:

• removed RGB WS2812 strip
• reflowed all of the diodes
• measured all of the diodes with a multimeter
• visually inspected the traces on the PCB
• erased and reflashed the Pro Micro with the default serial firmware

My Reddit searches suggest this is likely to be a diode problem instead of a broken trace problem, but after measuring and reflowing yielding no results, perhaps I'm wrong?

Pictures of PCBs