Where am I going wrong?

[Somersaults]

Well, where is my mum going wrong?!

She's making a blanket for my sister and adapted a pattern form Ravelry I think. Other projects got in the way and she's recently picked this one up again but the squares she's doing now are ending up bigger than the ones she's already done. She's come to me as her expert to ask what the problem is but I can't spot it from the picture. I'm wondering if it's just tension. It doesn't help that she's in Australia and I'm here!

Could anyone with more skill and expertise than the two of us out together have a gander at the picture and figure out why the middle one is bigger?

Thank you :)

The stitches look the same so I would say it is either a tension issue or she has changed hook size. Perhaps suggest to her that she goes down a size and see if the squares come out the same size as the originals.

Lovely colours

I asked about hook size but she says she's definitely using the same hook.

I think her colour choices are lovely too. My very lucky niece will have this when it is finished!

Thank you for your help :)

It just looks like a looser tension to me. It looks more gappy.

Round 2 of the top square looks to be a different stitch to round 2 on the other squares.

It could well just be different tensions, I agree. Of is the middle one using DTR rather than TR stitches, as the stitches seem so much bigger.

I did wonder that but my mum only knows (UK) DC and TR! It's a pain that I can't just sit down with her and watch what she's doing.