Why did my score drop 4pts

[capricornchanges]

So I got a cc and it started reporting today, equifax went up, Experian went up but TU dropped. It’s the only cc I have and I kept utilization at about 28%

[Anonymous]

A new account can result in a AAoA and/or AoYA drop, either of which may create a scoring penalty.  You also likely received an inquiry for the account and it wouldn't be uncommon for the inquiry to drop your score 4 points.  The inquiry would only impact the bureau score that was pulled from your app.  Did you receive an inquiry on TU?  If so, that would explain the score drop there and not on the other 2B.

[capricornchanges]

No, inquiries are on all 3, equifax and Experian are reporting “ new account added” and went up 31 & 33 pts respectively, TU reports “ bank card balance increased 83.00” and dropped 4 pts, this is the only cc I have, it’s a 300 cap 1 with an 83 balance