Welcome to FDMB!
It's not entirely clear if this is a bounce. This may simply reflect your cat's pattern thus far on Prozinc or a combination of the cycle and a bounce. If you notice, you're seeing a drop in numbers by around 4 hours after you've given a shot. The nadir (i.e., lowest point in the insulin cycle) can be as early at 4 hours after you've given a shot of Prozinc so those numbers in the 100s look to be a normal part of the cycle. After nadir, the numbers start to rise again. What we don't know is what's happening during the PM cycle.
In order to get you anchored with how we can be of the most help, I'd encourage you to get a spreadsheet set up. The instructions are in the post that Juls linked (the Help Us to Help You link). Having all of your test data on a spreadsheet will make it much easier to see patterns in the blood glucose (BG) data you're collecting. Attaching the spreadsheet to your signature will also allow us to look and offer suggestions. For example, based on the information you attached, it's important to get tests during the PM cycle. Getting at least a test before you go to bed every night will allow you to make sure your cat is in safe numbers. Without tests in the evening, you're missing half of your data.
Likewise, getting your signature set up will help you avoid us asking you the same questions over and over and over and over again (e.g., are you or your kitty Heidii, when was your kitty diagnosed, which insulin are you using, what are you feeding your cat).
There is a huge learning curve when it comes to first learning how to manage your cat's diabetes. However, it takes a surprisingly short time to get a routine established. Just think, you've already managed to start home testing!!
Please let us know how we can help.