First check that https://cs.wikipedia.org/wiki/MediaWiki:Citoid-template-type-map.json is sufficiently precise and up-to-date. This is the table mapping 34 Zotero types to your Wikipedia templates. If you need more templates, you should follow https://www.mediawiki.org/wiki/Citoid/Maps_TemplateData for the new templates (essentially add a key "map -> citoid" in the TemplateData of the template). (But I’m not sure you can add more than 4 templates, see https://www.mediawiki.org/wiki/VisualEditor/Citation_tool.)

If there is still an issue, could you give some examples to reproduce precisely this isssue?

In T209005#4731065, @Seb35 wrote:

First check that https://cs.wikipedia.org/wiki/MediaWiki:Citoid-template-type-map.json is sufficiently precise and up-to-date. This is the table mapping 34 Zotero types to your Wikipedia templates. If you need more templates, you should follow https://www.mediawiki.org/wiki/Citoid/Maps_TemplateData for the new templates (essentially add a key "map -> citoid" in the TemplateData of the template). (But I’m not sure you can add more than 4 templates, see https://www.mediawiki.org/wiki/VisualEditor/Citation_tool.)

You can add as many different templates as there are keys; https://www.mediawiki.org/wiki/VisualEditor/Citation_tool is for what shows up in the "manual" tab.

If there is still an issue, could you give some examples to reproduce precisely this isssue?

Yes, that would be helpful in diagnosing it.

Some of this may be: T114450 (which can be fixed with config on your local wiki), or potentially T206551 (which is definitely a bug that needs to be fixed in the back end). It may also be simply regression as we haven't updated Zotero in a while and this causes some miscasting (although usually just things getting incorrectly being cast as website). Currently all zotero updates and citoid development is frozen until T197242 can be completed.

Without specific examples it's hard to know which of these problems it may be.