I am setting a pattern for a sheep border/ plain weave tea towel.. have tied up for sinking shed. All the treadles work properly except for treadle ONE Treadle 1 has six tie ups and treadle 2 has 2….treadle one…one and two should stay up but two is sinking with the rest although not tied up. If you remove one tie up and only have five shafts tied up, two will stay up. Any suggestions