Issue with \dim_show:N \l__modiagram_atom_two_s_dim

I actually don’t know what I am doing but someone told me to come here and report it. I’ll put the error in the box. Thank you and let me know if there is anything I can do to help! Looks like you have some amazing packages for chemists!!
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> \l__modiagram_atom_two_s_dim=56.9055pt.
<recently read> }

l.84    \atom{left}{1s, 2s, 2p}

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