Hello, the minimum bid for this auction was 120€ and there was no other bid until 1 second before it ended, my max bid was 151.1€ but someone else won by bidding 120€ 1 second before it ended. But Bidslammer should've bid 120€ at 10 seconds left, it never did.

Hello Erwin,
Thank you for your question about this item. We can investigate to see what we encountered when we placed this snipe. We can't always determine why the bid was rejected, but we have maintained a list of possible reasons over the years. Here is a list of all of the account-related issues we track:
Abbreviated list:
https://bidslammer.com/help/bulletproof
Complete list:
https://bidslammer.com/help/status-messages/
The reason is almost always something on one of those lists.
Have you purchased from this seller previously?

?

I have already checked through these and I believe none of these is the issue, but its a lot, I don't know for sure. No I havent purchsed anything from this seller before.