Sharon:
Are you able to include a screenshot that shows the status of the Rematch Addresses pane when this behavior occurs?
I can't tell what's going on in the ones you've already provided. In those it's odd that you have multiple A & B candidates.
Are you using a locator created with the Create Address Locator tool or the Create Locator tool?
This issue may also be better addressed through Support where you can provide the exact steps and possibly data. The next release of ArcGIS Pro will be available soon and if the behavior is still reproduced in the new release submit the issue through Support. During the development cycle of the next release of Pro we addressed some odd behavior with rematch.