Since we've migrated our jira to cloud, i could realise the SLA Time to Resolution is always restarting when a ticket is reopened, However, this wasn't happening into the Jira Server.
I found something that might be the reason, although we had always the same configs, since the begining. In the workflow, it was made a config that when a ticket is reopened, the resolution will be cleared, as necessary to don't create any problem when searching for opened tickets.

But, when you look into the SLA configs, it was defined that the counting will start also when the resolution field be cleared,

Well, i would know please where we're making a mistake, and also how could we solve this, in order to when the next ticket be reopened, the SLA will keep counting where he was stopped, and not restarting again.