Hi @M_L ,
Could you maybe let us know the assignment operation ? It could be better if you show us the Screenshot of this, so that we can confirm the problem.
Also, Check by re-typing the statement/Expression (Not Copy Paste). When re-typing, make sure you remove the value, save it, then re-type the expression.
Let us know if you were able to perform this.
Additionally, take a look on the post below :