The tracker reply with message "server reply overflow" and I can't seed/leech these torrents.
I tried downloading the same torrents on another client (qB) and it works fine.

So I think this is some bug of Tixati, which I use as main client on every computer I have.

What OS? What version of Tixati?

is this a public or private tracker?

are more that one tracker giving you this message?

is this error constant or intermittent?

doesn't DHT or PEX connect you to others so that you can seed/download?

OS is Windows 10. Tixati 2.55

It's only on a private tracker as far as I know.

The error is constant.
Now I also found that the tracker doesn't count my upload stat when I use Tixati 2.55

The tracker does not allow DHT or PEX as it is a private tracker