Can't seem to keep thumbnails same size and aligned.

No promises, because this problem may be theme-related, but this is worth a try:
in the Admin panels, go to Settings, then Media.
Notice the checkbox “Crop thumbnail to exact dimensions (normally thumbnails are proportional)”
If you put a check in the box AND delete and re-add the Image to the Media Library, it will make your pictures line up nicely.

Unfortunately, it means all pictures must be “square” (equal width and height) or they will be cropped automatically. One solution to this problem, though hardly “nice”, is to use an Image Editor to add solid colour to match the page colour to the shorter sides of the image file.

Perhaps a better approach is to fix the Theme so that “Align Bottom” is set in the HTML.

Again, these are just ideas.

Hi Jonradio, thanks for your reply. Unfortunately that box is already checked. ??

In that case, it means that the pictures are not being display in Thumbnail size. That takes us back to the Theme.

Looking at the HTML, your Theme is /shopkeeper/. Since this is a Paid Theme from Themeforest, I am going to have to direct you to them as a “Commerical Product”:
https://codex.www.ads-software.com/Forum_Welcome#Commercial_Products

Here in www.ads-software.com support forums, we cannot test paid themes without paying for them, so it is not feasible to provide help here. Part of your payment to Themeforest covers their support.

Hope that they can help you resolve this.

Got it, thanks!