When you notice that all the profiles on Discover and your Likes and Match list only shows 4 photos, it's not a bug. This is an intentional change by Hinge, as explained in their official FAQ:

https://hingeapp.zendesk.com/hc/en-us/articles/15710328565523-Why-am-I-seeing-only-4-photos-on-profiles-

Hinge also said it is a temporary test. It is unknown how long this change will last.

Text prompts are still at 3. Voice, poll, and video prompts are still present and visible.

You can still see your own profile with the 6 photos.

If you are unhappy with this change and wants to let Hinge know, please submit feedback to Hinge. To do so, go to the link above and click on the text box button on the bottom right corner, which will open up the AI support chat. Type “contact support”, which will should bring up an option to submit feedback. Click on that and you’ll get a form to file a ticket. Please be polite when you submit feedback to Hinge.

Please use this Megathread to share your opinion about this change.

You can find the HingeX Megathread here.