What causes boots to blowout on the side of heel like this and how can it be corrected so this doesn’t continue to happen . I’m not 100% sure if it’s always the left boot .

9 2

4 0

2 1

2 1

1 0

12 1

0 0

0 0

0 0

8 1

0 0

0 0

0 0

3 1

0 0

1 0