Map Resolution Very Poor

I am trying to upload my map into Roll20, but the resolution it displays at is much worse than the resolution of the file. The image is a 4900x3080 JPG and is 2.7MB. When I drag the image onto the map layer, I select "Adjust Page Size" so that the VTT scales to the image. If I right-click on the image and try to set its dimensions, it is already showing 4900x3080. I have tried waiting for several minutes to see if a higher-res version of the image will load, but it does not. Here are screenshots of the native image and the Roll20 version being displayed at the same level of zoom. You can see how blurry the Roll20 display is in comparison. What can I do here? I put a lot of work into the details of this map, and they really can't be appreciated if the image can't be displayed at proper resolution.  

Hi William! Try zooming all the way out, and then back in. There is a display bug that can cause the wrong resolution source file to be pulled. (Roll20's creates several different resolutions of your original for display at different zooms.)

Thanks for the help, keithcurtis. This method did not work on the laptop I tested with at first, but in another browser on another computer the resolution was correct, and would update much more consistently with different zoom levels. Clearing my browser cache and reloading the map sometimes helps, but my laptop is still a bit inconsistent at pulling the highest resolution when zoomed in (Google Chrome, MacBook Air M2). I'm happy to see that it's working as intended on my desktop computer though.

I've been having this issue more consistently in the past couple of weeks. Nothing seems to work other than waiting a few days, clearing my browser history, or using another browser. It only seems to impact me (the GM). My work around, for now, may be to run a separate browser for uploads.

Not sure if it will help at all, but the default pixels is 70.  I noticed this same issue with some maps I imported, when I looked on the mapmakers site, they specify they had a higher pixel rating (etc 100).  When I set it to that pixel then adjust the map size dimensions, it seems to work better (for me anyways, also on a laptop). Saying this, I know nothing of how this works, so unsure if this is even a thing, or just in my head lol

Most maps in Roll20 modules are oversampled like this, usually at 200%, so long as there is no performance or quality issue. This yields better clarity while zooming. So there are 140 pixels in every square. If you are viewing at 100% of course, the browser and your screen only have 70 monitor pixels to use in that square, so that 140 pixels is virtually displayed within a 70 pixel space. (I.e. 2 image pixels are represented by 1 monitor pixels). If you zoom to 200%, one square is now magnified on your screen to be 140 pixels across, and your image now displays at 1:1 resolution --avatar pixels size. Unless you carefully manage your zoom level and know your image's actual resolution, you are almost never looking at the actual pixels of an image. This is true with most images on the Internet.