I have bought a lot of items on marketplace but they are not showing up in my history

[Dylana Whitfield]

One out of maybe 50 are posted on my account and then after that it goes back to last years purchases.

[Rolig Loon]

That's very odd.  You probably ought to submit a support ticket at https://support.secondlife.com/create-case/ .  Select Marketplace >> General Marketplace Issues.  The more important question, of course, is "Did you receive all of the things that you paid for?"  If the answer is yes, then the missing transaction log is curious but not worth losing sleep over.  If you didn't get the stuff you bought, though, that's a bigger issue.  It's hard to make a claim for non-delivery if the records are missing.