Problem with the addition of band

Dear all,

I wanted to doing some band addition to make like that : (displacement_VV_mst +
displacement_VV_slv1_21Oct2019 +
displacement_VV_slv3_02Nov2019 +
displacement_VV_slv5_14Nov2019 +
displacement_VV_slv7_26Nov2019 +
displacement_VV_slv9_08Dec2019 +

I have like 53 images in total and 2020, 2021 work well, end of 2022 too but some addition band doesn’t work at all and show me nothing. It’s very strange because my displacement map have values.

Do you know where that can come from ?