Lately I have seen numerous instances of the problem of which the following is an example. In the article titled "Causal graph", in the section titled "Example", the following code appears. The way it is rendered does not put the appropriate and standard amount of space between the notation preceding the "=" and the "=" itself. This began happening only recently.
Q_1 &= U_1\\
C &= a \cdot Q_1 + U_2\\
Q_2 &= c \cdot C + d \cdot Q_1 + U_3\\
S &= b \cdot C + e \cdot Q_2 + U_4,