Translation:I do not know anyone working in this office.
I'm very grateful to all the contributors of the Polish for English speakers course! Nice work! Also I'm very excited by fast and very detailed answers from moderators Jellei and Emwue and other students like Okcydent. Cheers guys! I'm going to keep my Polish tree gold, so I will stay here.
They are not 'constructed' at all on our ('language team') side, it's an app bug that we can do nothing about here. I also encounter such stuff sometimes (the Russian course, mostly), usually with the longer sentences. But I also know that on other occasions I did the same sentence 'normally'.
Thank you for your kind words :)