Lines and numbers showing through on your canvas? This is very common with all paint by numbers with light colours.
You can quickly fix this issue by using a white paint marker or white acrylic paint. A white paint marker will cover the numbers or lines on the canvas, but make sure you use the white paint marker BEFORE you start painting over the numbers because you won’t be able to use the marker over dried paint, finished result or wet paint.
Go slowly, apply lightly/thinly and only cover 1 number at a time otherwise you will struggle to see which colour goes where.
NOTE: Keep your number reference sheet safe, so you can refer back to it to double check the number you have just blocked out