AdiIRC

I am not able to reproduce nor heard anybody with this issue.

Some things to try:

Disable all scripts.
Check all the rules and options in Options -> Highlights are correct.
Check File -> Rawlog for the incoming raw messages and whether they contain text matching the highlight rules.
If there are any raw message not matching a highlight rule, please provide the raw message and the specific highlight rule.

Also keep in mind that by default, all duplicate monitor panel items/messages are ignored, there is an option to disable that.

Also check Options -> Ignore and Options -> Highlights for rules where highlights are ignored for specific channel/users.

I feel damn stupid now but only 90%, the 3-4 times I tried previously the scroll couldn't/wouldn't go up, now it can and all the highlights are there hidden on top.

All the settings are fine, 0 scripts. Thanks again man.