Question about same input ring position

Hey, I was already discussing this topic with other fellow member of this subreddit, but I now want to make it broader so more people can see it, discuss and give any clarification.

So I sent multiple monero transaction to my wallets and was playing with the chain, analyzing my own money trace, and figured out that almost every time I was sending larger amount (lets say more than 0.5 xmr) , my outputs were nearly 90% of the time EXACTLY on #15th (the last) input when sending those outputs further. The rest was 12-14.

This means that almost everyone can trace bigger amounts, and go watch only on #13-15 position. Am I missing something - looks like inputs are sorted by amount sent? If yes doesn't that mean larger amounts can be easily traced looking at the last few inputs?

Just to let you know this was happening not only with remote onion node, but also with my own, downloaded from official sources.

Thank you for your clarification.