decomposes in the washing machine

I have worn for many sandals. This pair is high the lower end. When unpacking the adhesive residue fell on at the seam between footbed and outsole. Well, the sandals were also not very expensive. Adjusting the sandals was tedious, much more difficult than "normal". The reason is that the geometry is not optimal. Well, the sandals were also not very expensive. Today I washed the sandals in the machine, I can now only advise against. The footbed has partially separated from the outsole. Since this happened at two shoes do I go from a design flaw.

Conclusion: The sandals were not very expensive. After three months, I throw it in the garbage now. Because in my opinion, they belong too.