A problem with a table data is occurs, maybe you or somebody else delete it from database. Or something get wrong. Please delete the table in WordPress Dashboard and create it again. Or contact the plugin developer.

string(1264) "[["Service","Average cost","Basis for charges – hourly rate or fixed fees or combination of both","Experience and qualifications of those carrying out the service","Experience and qualifications of the Supervisors","Description of and cost of likely disbursements or average cost or range of costs","Which of these disbursements attract VAT and at what VAT rate","Key stages of the matter and likely timescales for each stage"],["Tribunal Claims","£5,000 - £30,000 average £255 plus VAT","Hourly rate","","","Courier fee - £20, £300 – plus VAT
Barrister’s Fees - £500 - £4,000 plus VAT per day
Medical records - £50  no VAT
Expert witnesses - £500 - £4,000 plus VAT per day","20% VAT
20% VAT
20% VAT","27 weeks average"]]"