Different batches?!

Hi friends! I took my first test at 13DPO, the bottom test, a strong positive. Yesterday, I picked up more tests thinking they were the same and got the result in the middle at 14DPO. Missed my period. This morning I took another test and it’s a stronger positive but still not as strong as 13DPO. I noticed the control line on the top 2 tests are a lot darker than the first one.

Are the tests that much different or is something else going on in my body? Any insight is appreciated!