Greetings @Антон Жидков ,
I recently wasn't able to see my issues on my board. My admin added me to the groups: "jira-usrs" & "jira-sw-usrs" and they appeared. So, my first guess would be to check the groups & permissions on your side.
Otherwise, consider to check the following listed below.
Custom Fields Check
Head over to Project settings and click on Fields. Make sure all the custom fields you need are listed there. Sometimes, if a field is missing, it can mess up how the timeline looks.
Issue Types set-up
Go to Project settings, then navigate to Issue types, click on Actions, and choose Edit issue types. Confirm that you've set up the issue types (like Task, Sub-task, and Epic) for your project. Pick one as the default, you can always switch back later.
Language and Character Check
If your site uses a language other than English, double-check for any special or unexpected characters in issue names, priorities, or other fields. Also, make sure there are no weird characters in the priority names. Looking at your username, I'd assume you would use Cyrillic often on all kinds of occasions in Jira, just like probably me from time to time*, is that right :)
p.s.
I am not sure whether that'd help, but maybe if you provide more context, I will try to narrow-down the possible causes.
Best,
SI
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