Unable to assign credits to experiment

URL of experiment: https://pavlovia.org/fordycea/drm_da1

Description of the problem: I had 200 credits shared with me on Pavlovia. These appear as available on my profile. However, when I try to assign credits to an experiment, no credits appear as available and I am unable to assign credits. Is there a way to access these credits? Is this an issue with the credits being shared rather than directly purchased on my account? Thanks!

I have this problem too.

In case anybody else has struggled with this - credits can be reassigned on the experiment page by putting the experiment in running mode and scrolling down to the slider.