Green’s Dictionary of Slang

(US) a mess, an error, a confusion.

1893		O. Wister ‘Texas Vocab.’ in Wister Owen Wister Out West (1958) 159: Bobble mistake, blunder.
1927		(con. 1917) J. Stevens Mattock 92: Lieutenant Dill brought us on right into line, without making a bobble; and that appeared to hearten him.
1934		S. Walker City Editor 245: It was pithy, expert professional stuff. The Columbia news, except for one or two bobbles, was authentic.
1951		P. Whelton Angels are Painted Fair 218: In case of a bobble Kray, being a real cop, could get away with it.