[kurlannaiskos]

in one case you might be confusing the I-180 with the I-185.
the I-185 was authorized for series production and a few were used by the 728 IAP.
the reason for their cancellation was made by Josef Stalin because he felt that Polikarpov had 'fallen out of favor'- a decision mostly based on the political mechanizations of A.S. Yakovlev. (I'm sorry to say)
I'm actually not sure of the reason for the I-180 cancellation , most likely that the development wasn't going anywhere.

in December 1940 the designation system in the USSR changed to what we recognize in more recent times.
BB-1 stood for Blizny Bombardarovshik or short-range bomber.
it was changed to Su-2 in favor of it's principle designer Pavel Sukhoi.