African Garden + shrubs

Weird Oakleaf Hydrangea Flowers

The above photo shows a normal truss of Hydrangea quercifolia 'Snow Queen.' This year, I discovered several bud clusters that don't look quite right.

Instead of a truss, the buds are interspersed with leaves. Other than the strange deformity, the plant appears healthy. Has anyone seen anything like this? Is it a symptom of a disease? Or is this another case of HHSBP (Horticultural Hypochondriac Syndrome By Proxy)?