Dear mradon,
this might look like a bug, but it is not. If the shell is not contracted, i.e. if you have just one exponent (1 s, 1 p, 1 d, etc.), the contraction coefficient is meaningless. Turbomole automatically normalizes the contraction coefficients to 1 - just the way it generally normalizes the contraction coefficients of the input basis sets.
In case of an uncontracted shell, the coefficient is not needed since it is one per definition. Hence:
1 d
0.091
1 d
0.091 0.00000
1 d
0.091 3.4994
is all the same.