The compost is too dry
The compost must not become too dry, as the decomposition of organic matter then stops. In dry weather, it may therefore be necessary to water the compost. The compost is moist if you can squeeze a few drops of water out of a handful of compost material.
If the compost is covered with a tarpaulin or similar, it may be necessary to water it with 10 liters of water 1-2 times a month during the summer months. Some times, more often if the weather is very hot and dry.
The compost smells ugly
A compost pile will only smell ugly if it does not work properly. Compost should smell of forest floor debris.
If the compost pile smells very ugly, it is because there is not enough oxygen inside the compost material for degradation. Instead, the garden waste is starting to rot. If the pile is very wet, it is easier to decay.
You can avoid this by mixing the garden waste well. Mix the moist garden waste, eg grass clippings, leaves and vegetable residues, well with more dry and coarse garden waste such as branches, twigs, dry plant stems and the like. That way more air enters the compost.
If things go wrong and the pile stinks, you can solve the problem by flipping the whole pile on the ground, mixing it well and throwing it back in the compost bin. You can also mix in more dry and coarse garden waste if the pile is very wet.
The compost attracts iberian (killer) snails
An open compost heap attracts snails, including killer snails. The snails overwinter in the compost pile and lay eggs here. However, it should not discourage you from having a compost pile in your garden. When the killer snails are lured to the compost pile, it becomes easier for you to fight them.