Best sleep sack

So we used the Merlin sleep suit which she loved but ever since we switched to the nested bean her sleep has not been great.

We’ve sleep trained and she’s slept though the night since 6 weeks old but honestly for the last month or longer it’s been rough.

I don’t get it, sometimes we end up putting her in our bed (when we are not even in it, bad habit I know).

Why does she sleep great in there and not in her crib anymore. Is she not comfy? Not warm? Thoughts?