Check In / Check Out rather than Issue / Return

One thing that I did notice when looking round the Robinson library was that the signs said Check In / Check Out for the self issue and return. Is this common practice?
The reason that it struck me was because I had already had a discussion with a senior manager at work about a brief report that I had produced for him which included the number of issues. He questioned the number of issues that I had stated that we had thinking that 'issues' meant problems rather than loans. I hadn't appreciated that it might be interpreted as such so will have to be more mindful in future. I had already changed visitors to users in order to be more generic.