Custom Translation shows up on other sites

If i add any custom translation text for any language, It applying to all the sites which use the same language

For example i have site A installed with erpnext, i am adding translation text (Sales Order to Job Card) for english language, everything working fine on Site A

If i login to site B, translation applied to this site also

So i restart sever and first login to site B then site A also working fine

If i login first to Site A all the site available in my server getting same translation

I am using domain based multi tenant and checked on different browser