The filters size are too little, they go in but with a gap . The air bypasses the filter. For as expensive as they are, they should fit perfect, without the gap where the air isn't filtered.
Your Merv 13 looks like merv 8 at local stores.i use honey well.and the size is half inch smaller all the way around but that shouldn't matter. Haven't used them yet to see if there good or not. I live on farm with a lot of dust. Time will tell.it would be nice to see all three to tell the difference.
So far, so good. Picked a pair of MERV13 for the AC/Furnace. Will watch them periodically to see who they are measuring up. Hoping it is a good replacement and one which continues to work going forward.
We'd had 2 of these filters installed over the last year or so, and they work very well. The old ones are filled evenly with dust, etc. The air particulate count goes way down after new one goes in.