The figures in square [] brackets are stated in the published document in () brackets but posting to the forum converts the closing ) to a smiley.
You wanted to write 990.8 in round brackets but got (990.

... so you wrote [990.8]
Sensible solution.Another approach is to put spaces around the number - that way you'll see ( 990.8 ).
Yet another solution is to add a useless tag pair if you really MUST get it bundled up. (990.8
) ... written (990.8[i
][/i
])