New item added in table but is not visible Selenium

I wrote test case that switch to modal window, fill all fields and clicks 'submit' button.

After that message appears with text that item has been added (and appears spiner that inform me that request gone to the server)

but item is not on the page, only table with titles is visible.

I added to my code Explicit Wait

wait.until(ExpectedConditions.visibilityOfElementLocated(By.xpath("//table//tr/td[3]"))

And wait for it 50 sec and my test fails with TimeOutException

However, when i am adding new item manually it appears immediately