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[LTC7801] Output capacitor issue

Hello,

I designed several power supply converting 49V into 12V (7A) but output tantale capacitors are destroyed after power-up, do you know what happened?

Please find the design in attachment.PDF

The tantale capacitors are TR3D157K016C0075.

Beside, after removing them (leaving 3 ceramics 22uF), the design works well : 12V not load and 11.74V at 7A. But I cannot explain why when the load is around 1 or 2A, the voltage up to 13V.

Thank you for your help