Conditions not working properly / Plugin not tested with latest wordpress

I have set different conditions with the plugin for different products in my shop (I use Mollie for payment – still in testmode). And somehow it doesn’t work properly. Some products will show different ways to pay, other products give a message that there is no payment method installed, but they have the same conditions…..??

I just can’t figure out what is going wrong. The only thing I see is that the plugin is not tested voor latest version of WordPress (5.4–nl_NL). Could that be the issue?
Then please update the plugin.

Kind regards.