Translation:It is not clean here. Please do some cleaning up.
It's not really wrong and sort of captures the meaning of “一下” making the request sound a bit less serious.
On the cell phone app, there is no typing in the translation exercises. You just click on the words from a list, which often is more of an English exercise than a Chinese one.
Reversing the two sentences should be a "wrong". Something is definitely wrong in your system!!
Why is "Here is not clean, please clean up a bit" not correct? The English translations are consistently wrong and it's driving me mad!