Describe the bug
The test results page for each monitor appears to be caching the screenshots for the last viewed monitor

To Reproduce
1 - open a real browser monitor and let the screenshots load
2 - go back to Uptime overview
3 - select a different monitor

You'll see the previous monitors' images remain there for some time, then go to a no image available state and then load the correct images

Expected behavior
The screenshots would either load directly with the correct ones for the monitor or show a loading icon