Modules cache?

Hello!
I have sidebar modules:

Tags - based on current category.
Universal Content - based on current category.

Sometimes those modules displays content from another category.
When I refresh page - content updates to correct.

Why it happens? May be I should disable cache for those modules?

Hello

it is a must do thing

Modules that depend on current page (and displayed in different pages) should have their caching disabled

Thanks.
I also found, that some modules, which should displays only on item pages - displays on category page.
After refreshing page this module disappears.



And vice versa, I have module, which should displays on any category, but not on item page.
But it displays on item pages too.



After cleaning cache - everything fine.

Is it also associated with caching?

I also want to understand, how to speed up site, because I have many modules, and disabling cache for them will slow down the site.
May be I need to enable System - Page Cache plugin, but I'm not sure how it will works.

the page cache plugin is only for very static site don'u sue it if you have many dynamic content