Hi there,
I'm Edward from Ecwid Team.
I've inspected your store page and found a reason why it happens.
The thing is, this issue is reproduced on small screens only, e.g., iPhone 4 and 5. The product images are centered on iPhone 6 and above. The same applies to Android devices depending on the screen size.
The reason is that your images have different proportions, and thus they can not be adjusted properly on smaller screens with the current WordPress container where the store is added to.
What we can do here is to force a certain image size on small screens so that they will be centered. Please go to the Ecwid Control Panel → Configuration → Design → Edit theme → Paste the code below to the bottom of the field → Activate and Save
Code:
@media screen and (max-width: 350px) {
td.ecwid-productBrowser-productsGrid-cell table img {
width: 170px !important;
height: 140px !important;
}
}
It should fix the problem you described.
Please let me know if you have any questions.