I'm starting to notice the pattern. Drops off TU, EQ or both, then reappears on EX.
I'm just guessing, but it could mean that TU and EQ are taking their duties to investigate and remove more seriously than is EX.
No surprise. JDBs and CAs with old debts, debts they cannot validate, or perhaps even debts of someone with your initials get dropped on your CRs.
Did you DV the CA?