This Challenge checker is producing false positives.
I do not qualify; but the checker says I do qualify.
I believe the issue is with BINGO squares containing multiple caches.
Checker says I qualify in Line2 across. I have not found GCJZPT.
Checker says I qualify in Line5 down: I have not found GC167YG.
In both cases; I found two caches (GC104K1 & GC1Q39V) in Col:O Row:2; so the checker counts 5 caches in those rows/cols. These two caches are both in the same square; so only one should be counted.