Thank you for getting in touch to report what you’re seeing. There have been a few threads on the ideal Topping settings to apply in order to use DSP with MQA.
You’ll want to set Enable MQA core decoder to yes
Set Topping Device Setup MQA capabilities to Renderer only
Your Topping will display OFS:
OFS means MQA or MQA Studio with Roon Core decoding MQA Core decoding and the DAC doing MQA rendering.
You can find more details on Topping MQA playback in this great thread: