What is the departure time? 

11:07 copenh to malmo 

150 SEK per person is the normal fee for the sj high speed train in 1st class. If your departure is before 9 o'clock you get free breakfast.

I don't know what train your screen shot is from but I see lots of trains from Malmö to Stockholm on the 19/8.

As the travel from Köpenhamn involves both Öresundståg and SJ you should not make the whole reservation at SJ. They will charge you for the travel with Öresundståg that you can travel for free with Interrail.

On sj.se you make the reservation from Malmö to Stockholm. Then you travel without reservation from Köpenhamn to Malmö.

Thank you, very helpful. And shame on SJ for ripping off people who don't read Swedish!

Unbelievable, my ticket is 'refundable' yet they keep 40 SEK if I cancel.

So they have ripped me off twice

SJ is a total scam for non Swedish people, customer service unreachable, registerring only with swedish social security number.

If they cancel a service you should never refund the fare yourself, by doing that you are removing your rights to be accommodated based on your original booking as well as your entitlement to a (partial) refund based on any delay to your journey.

Good point.

When I cancelled a ticket for a train that SJ had cancelled I got the full amount of the ticket paid back so that would be the normal routine I presume. 

When a train is cancelled and the delay at your final destination is expected to be more than 60 minutes, you always have 3 options (in short; see Regulation 1371/2007 article 16 for the full text):

1. Don't travel and have a full refund.
2. Travel with the first available connection.
3. Travel on a later date at your choice.

Railways are obliged to offer these options. Options 2 and 3 have to be without additional costs. With option 2, you're also entitled to compensation for delay.

That also means that only offering a refund is a breach of the EU Regulation, which certainly is not the normal routine, I should hope.