Cookies in IE are not cleared during test runs

Katalon versions tested: 7.0.10, 7.2.0
Situation. We have implemented the Onetrust cookie disclaimer.

The first thing every test does is agreeing with the cookie policy.

What we observe in IE is:
The first test is running perfect.
The other tests are failing due to the fact that the disclaimer is not shown.

I have this as first lines in all the tests:
WebUI.openBrowser(’’)
‘Delete all cookies after browser is opened’
WebUI.deleteAllCookies()
WebUI.maximizeWindow()

But still not all cookies or session data is cleared (the cookie disclaimer is not shown).

Any ideas on where to look?