How can I prevent the web client from focusing on records that are inserted or modified?

I am building a custom price list page based on a custom temporary price list table.
Due to high calculation time on a few price fields, the values of these fields are not calculated prior to the page loading.
Instead, these fields are calculated and modified 100 at a time by a page background task. This works fine with one exception:
Every few seconds the client GUI "jumps to" and focuses/selects the last of the 100 modified records.

So, my question is: How can I prevent the Client from doing this (I want the prices on the lines to be updated without the client responding - other than the values being shown correctly of cause)

-I am using runtime 7.0 and the client version is 18.0.23013.25057 if it makes any difference