Modify status doesn't work

Hello,

I have a process that changes the Status of an activity to Canceled. Unfortunatelly, for some records it does not work.

In the trace I can see that the Status is changed and for the right activity but, in that activity the status remains as before.

We can see that the value is the correct one for 'Canceled'.

This is after the execution of the process.

The process is an automatic one, that starts daily, and searches for activities type 'In progress' & 'Not started'.

Thank you