Left facing arrow logic is faulty

When depicting control flowing right or downwards, the diagram renders fine. However, when you attempt to force a leftwards operation, the arrow comes out wonky. Screenshot:


Code:

```
st=>start: Start:>http://www.google.com[blank]
e=>end:>http://www.google.com
op1=>operation: My Operation
sub1=>subroutine: My Subroutine
cond=>condition: Yes
or No?:>http://www.google.com
io=>inputoutput: catch something...

st->op1->cond
cond(yes)->io->e
cond(no,left)->sub1(left)->op1
```