People often get this wrong. Load capacity (or working load limit) is not the same as the breaking strength! Load capacity is the amount of weight the rope can be safely used with. Breaking strength is usually 4 to 7 times the load capacity, and it's the weight at which the rope is expected to actually break. Load capacity already takes into account that knots reduce the strength of the rope and that the weight might swing around.
If your rope has a 65 kg load capacity, then its tensile strength is somewhere around 260–455 kg. It's a bad picture, but it looks like it says "max load capacity", which makes sense. There is no way that an 8 mm poly rope has a breaking strength of only 65 kg. You can get a stronger one if you don't trust it, but if it's a good quality rope and the label is accurate, that rope can support your weight just fine.