Sharry Baby with shriveled bulbs

[Fresca86]

Hi All!

I've purchased my very first orchid about 3 weeks ago. The bulbs were plump and I didn't see any sign of it wrinkling. It was packed in sphagnum moss. I thought I would re-pot it in a bark and sphagnum moss mixture. I started to notice the bulb is beginning to shrivel. I've watered it once a week, and kept it in a spot with indirect sunlight.

The first picture was taken the first day I her home, the second photo was within the last 2 days.

Let me know what you guys think I am doing wrong.

Any advice would be appreciated.

Thanks