Number changes when I hit save

[生な太夫]

I am pasting a number into the variable set block, however it changes the last "1" to a "4".

[Henrik "The Developer" Lindqvist]

It's to be expected since the number is too large to store exactly as a Double-precision floating-point number, i.e. more that 53 bits.

It has nothing to do with pasting, just altering the number will do the same, even using it in an expression.